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By Ryan Mooney, Globe Correspondent

The third suspect arrested in connection with a Billerica home invasion over the summer that left a 22-year-old man dead has pleaded not guilty to murder.

Peter Bin, 25, of Peabody pleaded not guilty to charges including murder, attempted armed robbery, home invasion, and possession of a firearm on Monday in Lowell District Court. He was ordered held on $500,000 bail.

Prosecutors allege that Bin and two accomplices - Jason Estabrook, 28, and Gabriel Arias, 20, both of Lynn - broke into Quintin Koehler's home in Billerica on the morning of July 7 with the intention of robbing him.

"We allege that Bin, in a joint venture with others, including Estabrook, intended to rob the victim during a home invasion where, during a struggle, the victim was shot in the head," Middlesex District Attorney Gerry Leone said in a statement.

According to the district attorney's office, Billerica Police responded to 795 Boston Road shortly before 4 a.m. on July 7 to find the victim with a gunshot wound to the head. He was pronounced dead at Lahey Clinic.

Police believe the defendant's targeted the home because they believed marijuana and money would be present at the address.

Estabrook and Arias were arraigned on September 27 in Lowell District Court in connection with the incident. Judge Thomas Brennan ordered Estabrook held without bail, and Arias held on $20,000 cash bail. Arias was also held on a probation warrant from a case out of Lynn.

"This is a disturbing case of drugs fueling an act of gun violence," Leone said. "We intend to hold these men accountable for their actions that took the life of another person."

Ryan Mooney can be reached at globe.mooney@yahoo.com. Follow him on Twitter @mooney_ryan.